zmarty
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Posts posted by zmarty
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8 minutes ago, Ken Ross said:
Thanks webrunner, I agree. It was actually the GH5 and I was trying to duplicate, as close as I could, the terrible failures Max had doing the same shots. I really find it hard to believe the 14-140 lens has that much better AF, if any.
Can you please try to replicate his shots where he was showing a lens to the camera? I think those examples are the worst.
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When I am in replay mode (to view footage already shot), what physical button can I press to start playing the footage? I keep pressing on the Menu button because it seems natural to me, but the only way it works is to press the play icon on the screen. I don't understand why the Menu button does not start Play, since it works like that on most cameras I owned.
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57 minutes ago, Hanriverprod said:
Max goes over main af settings for 30 minutes. TLDW - conclusion, use manual focus.
After watching the entire video there is no other way to describe this other than damning for the autofocus system in the GH5. The egregious real life examples are in the second half of the video. I promise it is worth your time to view it all.
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8 hours ago, Andy J said:
Can you get a 1/2 second shutter on your GH5 and capture that on the Atomos in 10-bit timelapse or is the minimum shutter speed with that setup 1/24 of a second?
Just for clarification, the Atomos has features to capture timelapses just fine. I think I can set the shutter speed to whatever I want. That is what I was doing until now with my Sony A6300. I was saying that I wish I could leave the Atomos behind and only use the new GH5. Which I can't unfortunately due to the codec.
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I tried out Variable Frame Rate today (VFR). While the feature works fine the codec selection is not so great. At least in 4K, VFR only seems to work when selecting 8 bit 100 Mbps. I am disappointed that it does not work for the 10 bit 150 Mbps codec. I shoot a lot of timelapses in log format (so for GH5 it would be V-Log L) and I would have hoped this camera would let me get rid of my external Atomos recorder. Not so much
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53 minutes ago, Jn- said:
Hi ZMarty, I don't have yet a GH5 to test the above, but using an RX100 V uhd file it works great, as a test, thanks.
The only issue is that the audio file gets converted to a much smaller one (aac 128kb) than what was in the source file. Adding something like this does help -b:a 384k ... any suggestions? can a "copy" of the origional audio file be incorporated into the ffmpeg command maybe?
Yeah we can change the command line parameters to get better audio. I can take a look later.
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The 4K 10 bit files that GH5 records internally cannot be read by some software such as Resolve. Also, the files are in an inter-frame codec so editing crawls to a halt in some software.
The solution is to transcode from H.264 10 bit to an intraframe codec like Prores. Here is an ffmpeg command line that does that:
ffmpeg -i "input.mp4" -c:v prores_ks -profile:v 2 -qscale:v 11 -vendor ap10 -pix_fmt yuv422p10le "output.mov"But you have to be very careful to use an ffmpeg version that was compiled for 10 bit support.
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2 minutes ago, Hanriverprod said:
Simple handheld movements, pans and tilts.
Do you remember the settings for the first video? What is your opinion of the pans in the first video? I think there are motion problems, I don't know why.
- webrunner5 and Hanriverprod
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4K 60 fps 8-bit 150 Mbps footage shot in V-Log L yields green and magenta (compression?) artifacts when converted to Rec709 by DaVinci Resolve with their color management solution.
While the image below is a 2X magnification, it is also plainly visible in moving images at normal size. This is my dog's hair, btw
I wonder if the color processing for V-Log in Resolve is mostly geared towards Varicams.
I will also check 4K 30 fps 10 bit internal and external.
HOWEVER, if I color grade the same footage manually starting from the V-Log, without using automatic color management, then I can make it look better. The artifacts are still visible when pixel peeping, but not obvious during play:
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28 minutes ago, Emanuel said:
What lens?
What about tap to focus? Have you tested it for video?
The new Leica 12-60 variable f/2.8. Shooting 4K 60fps 8 bit and 4K 30 fps 10 bit in V-Log.
I did tap on the screen and used the shutter button a few times to coax it into focusing. It was slow. The reason why I am saying it's bizarre is that I don't yet understand what circumstances makes it fail to focus. Sometimes it works fine, especially for wider shots and when the entire object is in the frame.
Am I correct in assuming the contrast based focusing is done before the image gets converted to flat V-Log?
P.S. When the image does get in focus the image quality is fantastic.
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6 hours ago, hyalinejim said:
Yes, it's there. But have you ever spotted ghosting in any of the real world low light tests completed so far?
Yes this is pretty much what I am seeing. But having tested it indoors in the evening I can tell you that with footage involving people it's even worse in V-Log. And it's not only the ghosting. There is some sort of strange banding and other artifacts going on.
I watched two previous low light V-Log tests and I could not see the same ghosting that I am seeing in my production camera. It's either a firmware change, or it's the fact that there is not much panning in the test videos.
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1 minute ago, hyalinejim said:
How is the ghosting in Like709?
I will give it a try shortly. I am just a bit pissed because V-Log L is a paid license. And I need V-Log or something like it for what I do (I shoot HDR videos exclusively).
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43 minutes ago, zmarty said:
I will check multiple ISO settings and will report back here.
I checked all ISO values in the Natural and V-Log profiles (respectively), and I really don't like what I am seeing:
Natural: Ghosting is present at all ISO values, but it is less apparent at lower values. I would consider all ISO settings usable in this profile and I would not have much trouble delivering footage in this profile. But compared to my Sony A6300 the GH5 is much worse.
V-Log L: I set Noise Reduction and Sharpness to -5 (minimum values). Ghosting is present at all ISO values, but it is much more severe. More specifically, everything below and including ISO 800 is reasonable. ISO 1600 is OK but ghosting is quite visible. Anything at 3200 or above has way too much ghosting and I would not shoot anything at this ISO or higher.
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1 minute ago, hyalinejim said:
OK, but at what ISO? I would expect to see very little to no ghosting at base ISO, and for it to increase as ISO increases.
I will check multiple ISO settings and will report back here.
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2 minutes ago, hyalinejim said:
If it's any consolation, having been through this issue with the XC10, ghosting is a hell of a lot more noticeable in a still image than a moving image. But once you see it, it's hard to unsee it. I don't have a GH5 yet so I can't corroborate for you. But if you'd like others to test if their units are affected (and my guess is that it's universal) then you need to tell us what ISO you're seeing ghosting at.
To minimise it:
1. Keep ISO low where possible
2. Turn NR to minimum (theoretically this should decrease it)
3. Find the profile that has the least ghosting
4. Keep movement to a minimum
5. Try not to worry too much about it. 99% of the population won't be able to see it.I will try that.
Normally I would agree with you that most people would not see it. It is present in all profiles and I can live with that. However, as you can probably see from my test videos above, the ghosting in V-Log is so extreme that none of my test videos have been usable. It is obvious to anybody watching the footage.
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6 hours ago, zmarty said:
I can do even better than that, I will post test videos:
Natural: http://files.hdrcolorgrading.com/2017-04-GH5-Tests/natural.MP4
V-Log: http://files.hdrcolorgrading.com/2017-04-GH5-Tests/vlog.MP4
These are UHD 60fps, straight from the camera and untouched. The videos were taken seconds from one another. The only difference between them is the picture profile.
The natural profile has issues as well, but the V-Log problems are quite severe. I hope it's something really simple that I am missing.
I don't know the value of the ISO, I will try more detailed experiments tomorrow.
I also tried outputting to an external monitor, both in 8 bit and 10 bit, at 24, 30 and 60 fps. The ghosting is still very visible.
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12 minutes ago, hyalinejim said:
Have you tried turning Noise Reduction all the way down?
Yes. I tried with 0 which is the default and with -5, which is the minimum. No major difference. Will try more.
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10 minutes ago, hyalinejim said:
Post frame grabs.
Does it happen at all ISOs?
I can do even better than that, I will post test videos:
Natural: http://files.hdrcolorgrading.com/2017-04-GH5-Tests/natural.MP4
V-Log: http://files.hdrcolorgrading.com/2017-04-GH5-Tests/vlog.MP4
These are UHD 60fps, straight from the camera and untouched. The videos were taken seconds from one another. The only difference between them is the picture profile.
The natural profile has issues as well, but the V-Log problems are quite severe. I hope it's something really simple that I am missing.
I don't know the value of the ISO, I will try more detailed experiments tomorrow.
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I am having major issues with V-Log on the GH5. I see significant ghosting and some sort of banding when I pan left and right. It only happens in V-Log, regardless of frame rate, aperture, or shutter speed. I am familiar with S-Log so maybe I am missing something obvious with V-Log?
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15 minutes ago, SuperSet said:
Anyone seen any more downloadable VLog footage outside of Luke Neumann's earlier ones?
See below. You need to be logged in to download the original file.
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Adorama just shipped my GH5 overnight. It will get here (US, West Coast) by 10AM in the morning!
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Adorama (US) just charged my credit card. I preordered the GH5 body on 2/23. So I am guessing the US release will happen tomorrow, on schedule.
GH5 tips tricks and questions only
In: Cameras
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Thanks, that's unfortunate. I will just have to adjust